<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/头像.jpg" alt="" />
      </div>
      <!-- 表单登录区域 -->
      <el-form ref="loginFormRef" :model="loginForm" :rules="longFormRules" label-width="0px" class="login_form">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima" type="password"></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //这是登录表单form的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456',
      },
      //这是表单验证规则对象
      longFormRules: {
        //验证用户名是否合法
        username: [
          {
            required: true,
            message: '请输入用户名',
            trigger: 'blur',
          },
          {
            min: 3,
            max: 10,
            message: '长度在 3 到 10 个字符',
            trigger: 'blur',
          },
        ],
        //验证密码是否合法
        password: [
          {
            required: true,
            message: '请输入登录密码',
            trigger: 'blur',
          },
          {
            min: 6,
            max: 16,
            message: '长度在 6 到 16 个字符',
            trigger: 'blur',
          },
        ],
      },
    }
  },
  methods: {
    //点击重置按钮，重置登陆表单
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields()
    },
    login() {
      //表单预验证
      this.$refs.loginFormRef.validate(async (valid) => {
        // console.log(valid);
        if (!valid) return
        ////valid为true，验证成功，就发请求，请求登录地址
        const { data: res } = await this.$http.post('login', this.loginForm)
        // console.log(res);
        if (res.meta.status !== 200) return this.$message.error('用户名或密码错误!')
        this.$message.success('登录成功！')
        //1.将登录成功之后的token保存到客户端的sessionStorage中
        //1/1项目中除了登陆外的其他api接口，必须在登陆之后才能访问
        //1.2token只应该在当前网站打开期间生效，所以将token保存在sessionStorage
        window.sessionStorage.setItem('token', res.data.token)
        //2.通过编程式导航转到后台主页，路由地址是/home
        this.$router.push('/home')
      })
    },
  },
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);

  .avatar_box {
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 5px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
.btns {
  display: flex;
  justify-content: flex-end;
}
</style>